15720000000 has 320 divisors, whose sum is σ = 52748302464. Its totient is φ = 4160000000.

The previous prime is 15719999989. The next prime is 15720000001. The reversal of 15720000000 is 2751.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (320).

It is a hoax number, since the sum of its digits (15) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15720000001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119999935 + ... + 120000065.

Almost surely, 2^15720000000 is an apocalyptic number.

15720000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15720000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26374151232).

15720000000 is an abundant number, since it is smaller than the sum of its proper divisors (37028302464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15720000000 is an frugal number, since it uses more digits than its factorization.

15720000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 15.

Adding to 15720000000 its reverse (2751), we get a palindrome (15720002751).

The spelling of 15720000000 in words is "fifteen billion, seven hundred twenty million", and thus it is an aban number.